Weaving machine having component warp beams

ABSTRACT

The component warp beams are each provided with a blocking means in order to temporarily lock the warp beams during the reed beatup portion of the machine cycle. The blocking means includes hydraulically actuated brake heads for engaging a brake disc on each warp beam or a warp beam gear for controlling the let-off motion of a warp beam. The blocking means can also include an electrically operated brake.

U 1 7 1 ,1, I I

States 1191 a 1111 3,871,418

Hintsch [4 Mar. 18, 1975 [5 WEAVINGMACHINE HAVING 2,625,021 1/1953 sChoenStel et a1. 66/86A 3,426,806 e. 2/1969 Pfarrwaller 139/l0l COMPONENT WARP BEAM? 3,470,921 10/1969 Booth 139/109 75 Inventor: 01m Hintsch, walllsellen/CH, 3,534,779 10/1970 Matouch 139/101 1 Swltzer and FOREIGN PATENTS OR APPLICATIONS 1731 Assignee Bmthers Wimerthur, 464 111 l1/l968 Switzerland 139/25 swlllerland 476.137 9/1969 Switzer|and.. 139/101 22 Filed: 2 1973 1,033,324 4/1953 France 139/100 [21] Appl' 392184 Primary Examiner-James Kee Chi Attorney, Agent, or Firm-Kenyon & Kenyon Reilly [30] Foreign Application Priority Data & ChaPin Oct. 3, 1972 Switzerland .1 014421/72 [57] ABSTRACT [52 11.5. C1 139/100, 139/101, 66/86 A, The component warp beams are each provided with a [51 llll. Cl D03d 49/06 blocking means Order to temporarily lock the warp [58] Field 01' Search 139/100, 109, 110, 25, beams during the reed beagup portion of the machine 139/102 101; 66/86 A cycle. The blocking means includes hydraulically actuated brake heads for engaging a brake disc on each [56] References C'ted warp beam or a warp beam gear for controlling the UNITED STA ES P T let-off motion of a warp beam. The blocking means 407,872 7/1889 Moore 139/101 x can also include an electrically operated brake. 1,564,162 12/1925 Wiese ..1 66/86 A 6 Cl 3 F; 2,430,022 11/1947 Lambach 139/110 x rawmg WEAVING MACHINE HAVING COMPONENT WARP BEAMS This invention relates to a weaving machine having component warp beams.

As is known, weaving machines having component warp beams frequently have faults occur in the end product along the component warp beam division during let-off.

Accordingly, it is an object of the invention to eliminate the occurrance of faults in the cloth let-off from component warp beams during beat-up in a weaving machine.

Briefly, the invention is directed to a weaving machine having at least two component warp beams and a main drive shaft. The invention starts from the knowledge that beat-up may cause an uneven movement or vibration of the discrete component warp beams. Thus, if the warp beams could be blocked, i.e. located, during beat-up, such movements or vibrations can be eliminated and the faults usually resulting therefrom in the finished cloth obviated. To this end, the invention provides the weaving machine with a blocking means for selectively blocking rotation of each warp beam during a predetermined portion of the machine cycle as well as with a control means for activating the blocking means in synchronism with the rotation of the drive shaft. The time at which the blocking means is activated corresponds to the reed beat-up.

The blocking means can be hydraulically actuacted or electrically actuated. For example, in one embodiment, the blocking means can utilize a brake shoe system which cooperates either with a brake disc on an individual warp beam or a warp beam gear which controls the let-off motion of an individual warp beam. Such a brake shoe system can be activated hydraulically via a piston and cam arrangement off the motion of the drive shaft. Also, the blocking means can utilize an electrically controlled multiple-disc brake for blocking movement of a warp beam gear which serves to control the let-off motion of a warp beam.

These and other objects and advantages of the invention will become more apparent from the following detailed description and appended claims taken in conjunction with the accompanying drawings in which:

FIG. 1 diagrammatically illustrates a view of two component warp beams associated with a hydraulic blocking means operative on adjacent warp beam discs in accordance with the invention;

FIG. 2 illustrates a view corresponding to FIG. 1 of a hydraulic blocking device acting on warp beam gears according to the invention; and

FIG. 3 illustrates a view of an electric blocking device used in accordance with a further embodiment of the invention.

Like elements have like references throughout the drawings.

Referring to FIG. 1, a pair of component warp beams 1, 2 are rotatably mounted at one end in bearings 3, 4 which are shown diagrammatically and which are disposed in the uprights (not shown) of a weaving machine while the opposite ends are mounted in a common centralized bearing 5, also disposed in uprights of the weaving machine. Each warp beam 1, 2 has a pair of pulleys or discs which, serve to safeguard the warp windings of the beam. Of these, the inner pulleys 6', 7 each carry a brake disc 8, 9 which extends radially outwardly of the respective beam 1, 2 and pulleys 6, 7 and is fixedly mounted on the respective beam 1, 2. As shown, the beams 1, 2 are coaxially mounted and dis posed in adjacent relation to sub-divide the machine width.

A blocking means for selectively blocking rotation of each war'p beam 1, 2 via the brake discs 8, 9 includes a brake head 12 having two brake shoe systems 10, 11 which are hydraulically operated in known manner. Each brake shoe system 10, 11 is mounted about a brake disc 8, 9 so as to engage the brake disc 8, 9 when actuated. This causes locking of the brake disc 8, 9 and thus prevents the warp beams l, 2 from rotating.

In order to activate the blocking means, a control means is connected to the brake head 12. This control means includes a hydraulic line 13 connected in common to the brake shoe systems 10, II, a master cylinder 14 which supplies hydraulic fluid to the line 13 and which has a piston (not shown) moved automatically by way of a piston rod 15 and a cam 16. The cam 16 is fixedly mounted with respect to a main drive shaft 17 of the weaving machine to rotate therewith and is shaped so that the blocking means 6 12 retains the warp beams l, 2 during sley movement and, thus, during beating-up.

Referring to FIG. 2, instead of using a common brake head, individual brake heads 21, 22 are associated with each warp beam 1, 2 with each brake head 21, 22 including a brake shoe system actuated over a hydraulic line 23 from a control means as above. Further, instead of cooperating with brake discs on the beams, the

brake heads 21, 22 cooperate with warp beam gears 24, 25 which are mounted on the shafts of the warp beams l, 2 and control the warp let-off motion. In order to block rotation of the warp beams l, 2, the brake shoe systems of the brake heads 21, 22 are activated to engage about each warp beam gear 24, 25 during beat-up as above.

Referring to FIG. 3, instead of using a hydraulic blocking means, an electro-mechanicalblocking means can be used. As shown, this comprises, for each warp beam, an electrically controlled multiple-disc brake 31 which is mounted on the machine frame and is operative on a pinion 33 meshing with a warp beam gear 32 for a beam 1. The brake 31 can be controlled by any suitable control means, such as a switch, operated by a cam rotating at main shaft speed.

Advantageously, the duration of component beam blocking is determined experimentally and can be less or more than the duration of reed movement.

The invention is not limited to the embodiments described and, of course, can be used in weaving machines and looms having more than two component warp beams. Differently devised blocking means and control and actuating means are also feasible.

What is claimed is:

1. In a weaving machine having at least two coaxially mounted component warp beams, said beams being disposed in adjacent relation to sub-divide the machine width and a main drive shaft;

a blocking means for selectively blocking rotation of each warp beam during a predetermined portion of a cycle of said machine; and

control means for activating said blocking means in synchronism with the rotation of said drive shaft whereby during beat-up said warp beams are locked in place.

2. In a weaving machine as set forth in claim 1 wherein each warp beam includes a brake disc fixedly.

mounted thereon and said blocking means includes a brake head having two brake shoe systems, each brake shoe system being positioned about a respective brake disc to engage therewith during said predetermined piston rod in said master cylinder.

4. In a weaving machine as set forth in claim 1 which further includes a warp beam gear connected to a respective warp beam for controlling a let-off motion of said respective warp beam and said blocking means includes a pair of brake heads each having a brake shoe system positioned about a respective gear to engage therewith during said predetermined machine cycle portion.

5. In a weaving machine as set forth in claim 4 wherein said control means is hydraulically connected between said drive shaft and said brake heads.

6. In a weaving machine as set forth in claim 1 which further includes a warp beam gear connected to a respective warp beam for controlling a let-off motion of said respective warp beam, and said blocking means includes an electrically controlled multiple-disc brake operatively connected to a rotatablepinion disposed in meshing engagement with a respective said gear.

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1. In a weaving machine having at least two coaxially mounted component warp beams, said beams being disposed in adjacent relation to sub-divide the machine width and a main drive shaft; a blocking means for selectively blocking rotation of each warp beam during a predetermined portion of a cycle of said machine; and control means for activating said blocking means in synchronism with the rotation of said drive shaft whereby during beat-up said warp beams are locked in place.
 2. In a weaving machine as set forth in claim 1 wherein each warp beam includes a brake disc fixedly mounted thereon and said blocking means includes a brake head having two brake shoe systems, each brake shoe system being positioned about a respective brake disc to engage therewith during said predetermined machine cycle position.
 3. In a weaving machine as set forth in claim 2 wherein said control means Includes a master cylinder having a piston rod slidably mounted therein, a cam on said drive shaft for reciprocating said piston rod in said master cylinder in synchronism with the rotation of said drive shaft, and a hydraulic line connecting said master cylinder to said brake shoe system to activate said brake shoe systems in response to movement of said piston rod in said master cylinder.
 4. In a weaving machine as set forth in claim 1 which further includes a warp beam gear connected to a respective warp beam for controlling a let-off motion of said respective warp beam and said blocking means includes a pair of brake heads each having a brake shoe system positioned about a respective gear to engage therewith during said predetermined machine cycle portion.
 5. In a weaving machine as set forth in claim 4 wherein said control means is hydraulically connected between said drive shaft and said brake heads.
 6. In a weaving machine as set forth in claim 1 which further includes a warp beam gear connected to a respective warp beam for controlling a let-off motion of said respective warp beam, and said blocking means includes an electrically controlled multiple-disc brake operatively connected to a rotatable pinion disposed in meshing engagement with a respective said gear. 